(1047) Larson, M. M. 



1963. Initial root development of ponderosa pine seedlings as related to germination 



date and size of seed. Forest Sci. 9: 456-460. 



(1048) Lavender, Denis P. 



1955. Ponderosa pine seed germination after exposure to varying temperatures and 

 humidities. Oreg. State Board Forest. Res. Note 24, 4 pp. 



(1049) and George H. Atherton. 



1964. Sonic treatment of Douglas -fir and ponderosa pine seeds and seedlings. Oreg. 



State Univ. Res. Note 48, 16 pp. 



(1050) Lavin, F. 



1953. Intermediate wheatgrass for reseeding southwestern ponderosa pine and upper 

 woodland ranges in the Southwest. U.S. Forest Serv. Southwestern Forest 

 and Range Exp. Sta. Res. Rep. 9, 11 pp. 



(1051) 



1953. Guide for reseeding burned and logged-over ponderosa pine lands in the South- 

 west. U.S. Forest Serv. Southwestern Forest and Range Exp. Sta. Res. 

 Note 10, 11 pp. 



(1052) andH. W. Springfield. 



1955. Seeding in the southwestern pine zone for forage improvement and soil protec- 

 tion. U.S. Dep. Agr., Agr. Handb. 89, 52 pp. 



(1053) Lawrence, William H. 



1958. Wild fire damage control problems on Pacific Northwest tree farms. North 

 Amer. Wildlife Conf. Trans. 23: 146-152. 



(1054) , Nelson B. Kverno, andH. D. Hartwell. 



1958. Field guide to identification of animal damage on Douglas -fir and ponderosa pine. 

 Northwest Pest Action Counc. Bull. , 32 pp. 



(1055) Lawson and Sons . 



1836. First description of Pinus ponderosa. Agr. Manual, England. 



(1056) Leaphart, Charles D. 



1955. Preliminary observations on a current outbreak of western gall rust ( Cronartium 

 coleosporioides). U.S. Agr. Res. Serv. Plant Dis. Reptr. 39: 314-315. 



(1057) 



1958. Root characteristics of western white pine and associated species in a stand 



affected by pole blight of white pine. U.S. Forest Serv. Intermountain For- 

 est and Range Exp. Sta. Res. Pap. 52, 10 pp. 



(1058) 



1959. Drought damage to western white pine and associated tree species. U.S. Agr. 



Res. Serv. Plant Dis. Reptr. 43: 809-813. 



(1059) 



1963. Dwarfmistletoes: a silvicultural challenge. J. Forest. 61: 40-46. 



(1060) LeBarron, Russell K. 



1948. Slash disposal by spot burning and dozer piling in ponderosa pine type. U.S. 



Forest Serv. Northern Rocky Mountain Forest and Range Exp. Sta. , 9 pp. 



(1061) 



1957. Silvicultural possibilities of fire in northeastern Washington. J. Forest. 55: 

 627-630. 



